.. you can't make a single valid argument.
Yes, governments can ban crypto, end of story. Imagine how much of it is worth when all the HFs have to cash out from crypto and the only thing you can spend it is alpaca socks from Peru.
Future of money!!
You only need the US, the EU and China banning it and show is over. Retailers can't legally accept it (kind of the purpose of money), so the best you can buy is Russian brides and Indian slave labor. (and the above mentioned alpaca socks)
Nobody is going to give a shit if you still have coins on your laptop and you can trade it with your fellow basement dwellers. You can do the same with WoW levels or whatever.
And there will be no legal protection after any kind of exit scam or brokerage fun stuff (like robotrading against customers). After all heroin dealers don't go to court with their disputes...